Fastest way to detect duplicate numbers on array vb.net 2005

Question

I have this project that let user inputs 5 different numbers from 1 to 50. But I want to validate it before saving to DB that i will be 5 unique numbers. What\'s the best an

Answer 1

Reed Copsey's suggestion to use hash sets was a good one (I hadn't worked with the HashSet class before).

But I then discovered that the IEnumerable class offers an extension method called Distinct that copies the unique values from a source IEnumerable to a target IEnumerable.

Borrowing the first line of Reed's sample code, here's the new sample VB.NET code:

    Dim numbers As IEnumerable(Of Integer) = GetInputFromUser()
    Dim isUnique As Boolean = (numbers.Distinct.Count = numbers.Count)

The variable isUnique is True if the numbers IEnumerable contains no duplicate values, or False if it contains one or more duplicate values.